<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// |         lanfengye <zibin_5257@163.com>
// +----------------------------------------------------------------------

class Page {
    
    // 分页栏每页显示的页数 [1] [2] ... [5] 页码数
    public $rollPage = 5;
    // 页数跳转时要带的参数
    public $parameter  ;
    // 分页URL地址
    public $url     =   '';
    // 默认列表每页显示行数
    public $listRows = 20;
    // 起始行数
    public $firstRow    ;
    // 分页总页面数
    protected $totalPages  ;
    // 总行数
    protected $totalRows  ;
    // 当前页数
    protected $nowPage    ;
    // 分页的栏的总页数
    protected $coolPages   ;
    // 分页显示定制
    protected $config  =    array('header'=>'条记录','prev'=>'prev','next'=>'next','first'=>'首页','last'=>'末页','theme'=>'  %upPage% %prePage% %linkPage% %nextPage% %downPage% ');
    // 默认分页变量名
    protected $varPage;

    /**
     * 架构函数
     * @access public
     * @param array $totalRows  总的记录数
     * @param array $listRows  每页显示记录数
     * @param array $parameter  分页跳转的参数
     */
    public function __construct($totalRows,$listRows='',$parameter='',$url='') {
        $this->totalRows    =   $totalRows;
        $this->parameter    =   $parameter;
        $this->varPage      =   C('VAR_PAGE') ? C('VAR_PAGE') : 'p' ;
        if(!empty($listRows)) {
            $this->listRows =   intval($listRows);
        }
        $this->totalPages   =   ceil($this->totalRows/$this->listRows);     //总页数
        $this->coolPages    =   ceil($this->totalPages/$this->rollPage);
        $this->nowPage      =   !empty($_GET[$this->varPage])?intval($_GET[$this->varPage]):1;
        if($this->nowPage<1){
            $this->nowPage  =   1;
        }elseif(!empty($this->totalPages) && $this->nowPage>$this->totalPages) {
            $this->nowPage  =   $this->totalPages;
        }
        $this->firstRow     =   $this->listRows*($this->nowPage-1);
    }

    public function setConfig($name,$value) {
        if(isset($this->config[$name])) {
            $this->config[$name]    =   $value;
        }
    }

    /**
     * 分页显示输出
     * @access public
     */
    public function show() {
        if(0 == $this->totalRows) return '';
        $p              =   $this->varPage;
        $nowCoolPage    =   ceil($this->nowPage/$this->rollPage);

        // 分析分页参数
        if($this->url){
            $depr       =   C('URL_PATHINFO_DEPR');
            $url        =   rtrim(U('/'.$this->url,'',false),$depr).$depr.'__PAGE__';
        }else{
            if($this->parameter && is_string($this->parameter)) {
                parse_str($this->parameter,$parameter);
            }elseif(is_array($this->parameter)){
                $parameter      =   $this->parameter;
            }elseif(empty($this->parameter)){
                unset($_GET[C('VAR_URL_PARAMS')]);
                $var =  !empty($_POST)?$_POST:$_GET;
                if(empty($var)) {
                    $parameter  =   array();
                }else{
                    $parameter  =   $var;
                }
            }
            $parameter[$p]  =   '__PAGE__';
            $url            =   U('',$parameter);
        }
        //上下翻页字符串
        $upRow          =   $this->nowPage-1;
        $downRow        =   $this->nowPage+1;
        if ($upRow>0){
            $upPage     =   "<a href='".str_replace('__PAGE__',$upRow,$url)."' class='prev' ><i></i>".$this->config['prev']."</a>";
        }else{
            $upPage     =   '';
        }

        if ($downRow <= $this->totalPages){
            $downPage   =   "<a href='".str_replace('__PAGE__',$downRow,$url)."' class='next'><i></i>".$this->config['next']."</a>";
        }else{
            $downPage   =   '';
        }
        //<< < > >>
        if($nowCoolPage == 1 && ($this->nowPage + 1) < $this->rollPage){
            $theFirst   =   '';
            $prePage    =   '';
        }else{
            //$preRow     =   $this->nowPage-$this->rollPage;
            //$prePage    =   "<a href='".str_replace('__PAGE__',$preRow,$url)."' >...</a>"; //上5页改成了 <<
            $theFirst   =   "<a href='".str_replace('__PAGE__',1,$url)."' >1</a>";
        }
        if($nowCoolPage == $this->coolPages){
            $nextPage   =   '';
            $theEnd     =   '';
        }else{
            //$nextRow    =   $this->nowPage+$this->rollPage;
            $theEndRow  =   $this->totalPages;
            //$nextPage   =   "<a href='".str_replace('__PAGE__',$nextRow,$url)."' >...</a>";   // 下5页 改成了 >>
            $theEnd     =   "<a href='".str_replace('__PAGE__',$theEndRow,$url)."' >".$theEndRow."</a>";
        }

 
        $half  = floor($this->rollPage/2);
        if(($this->nowPage-$half)>$half && $this->totalPages>$this->rollPage && $this->nowPage>=$this->rollPage){
            $prePage    =   $theFirst."<span class='dot'>...</span>"; //上5页改成了 <<
        }else{
            $prePage    =   '';
        }
        if(($this->totalPages-$this->nowPage)>$half && $this->totalPages>$this->rollPage){
            $nextPage   =   "<span class='dot'>...</span>".$theEnd; // 下5页 改成了 >>
        }else{
            $nextPage    =   '';
        }
        // 1 2 3 4 5
        $linkPage = "";
        if($this->nowPage>$half){
            $front = $half;
            if(floor(($this->nowPage+1)/2)<=$half){
                $front = $this->nowPage - 1;
            }
            if(($this->totalPages - $this->nowPage)<$front){
                $newFront = $this->rollPage-($this->totalPages-$this->nowPage)-1;
                $front = $newFront > $front ? $newFront : $front;
            }           
            $behind = $half;                
        }else{
            $front = $this->nowPage-1;
            $behind = $this->rollPage-$this->nowPage;
        }
        
        for($i=$front;$i>=1;$i--){
            $page       =  $this->nowPage - $i;
            if($page > 0)
                $linkPage .= "<a href='".str_replace('__PAGE__',$page,$url)."'>".$page."</a>"; //去掉了此处的空格
        }
        $linkPage .= "<span class='current'>".$this->nowPage."</span>";
        for($i=1;$i<=$behind;$i++){
            $page       =  $this->nowPage + $i;
            if($page <= $this->totalPages)
                $linkPage .= "<a href='".str_replace('__PAGE__',$page,$url)."'>".$page."</a>"; //去掉了此处的空格
        }     

        $pageStr     =   str_replace(
            array('%header%','%nowPage%','%totalRow%','%totalPage%','%upPage%','%downPage%','%first%','%prePage%','%linkPage%','%nextPage%','%end%'),
            array($this->config['header'],$this->nowPage,$this->totalRows,$this->totalPages,$upPage,$downPage,$theFirst,$prePage,$linkPage,$nextPage,$theEnd),$this->config['theme']);
        return $pageStr;
    }

}